Minimum Time Difference.go

func stringAsMinutes(timeString string) int {
	hour := int(timeString[0] - '0') * 10 + int(timeString[1] - '0')
	minute :=  int(timeString[3] - '0') * 10 + int(timeString[4] - '0')
	return hour * 60 + minute
}

func findMinDifference(timePoints []string) int {
	sort.Strings(timePoints)
	lenOfTimes := len(timePoints)
	minuteArray := make([]int, 0)
	for i := 0; i < lenOfTimes; i++ {
		minuteArray = append(minuteArray, stringAsMinutes(timePoints[i]))
	}
	minuteArray = append(minuteArray, stringAsMinutes(timePoints[0]) + 24 * 60)

	lenOfMinute := len(minuteArray)
	var minDiff = 24 * 60
	for i := 1; i < lenOfMinute; i++ {
		diff := minuteArray[i] - minuteArray[i - 1]
		if (minDiff > diff) {
			minDiff = diff
		}
	}
	return minDiff
}